Re: Determining that a Pandoc Variable is the Empty String

["S. Manning" <scriptor-aFO/2INALiozYggVrLCuDg@public.gmane.org>]

That works for me!  I will add it to my 'lab notes'

On 2023-03-07 21:44, John MacFarlane wrote:
> Try
> 
> tags: []
> 
> in your YAML if you don't want the for loop to be executed.
> 
>> On Mar 7, 2023, at 8:41 PM, S. Manning <scriptor-aFO/2INALiozYggVrLCuDg@public.gmane.org> 
>> wrote:
>> 
>> I would like to add a tag system to my static site which I generate 
>> with Pandoc templates.  Adding a tags: variable in myPage.yaml is 
>> easy, but then I want to add links from pages with the tag to the page 
>> for that tag.  Code like:
>> 
>> $for(tags)$
>> <a href="https://mysite.org/tags/$tags$.html">⇐ back to 
>> $tags$</a>&nbsp;
>> $endfor$
>> 
>> adds a link even if the tags variable is empty ("tags: " in the YAML 
>> file).
>> 
>> How can I check that the tag is not empty or a null string or however 
>> Pandoc defines it?
>> 
>> https://pandoc.org/MANUAL.html#interpolated-variables alludes to 
>> variable types such as string and list, but does not define them or 
>> explain how to get the attributes of complex variables such as lists.
>> 
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